<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .div1{
            width: 40%;
            height: 400px;
            background: red;

            float: left;
        }
        .div2{
            width: 50%;
            height: 400px;
            background: #2fff3d;

            float: right;
        }

        .div3{
            width: 100%;
            height: 200px;
            background: silver;

            clear: both;
        }
    </style>
</head>
<body>


    <div class="div1">

    </div>
    <div class="div2">

    </div>


    <div class="div3"></div>

</body>
</html>
